SharePoint Framework Web Part Failing to Load After Deploying Updated Package

Question

I’m dealing with a SharePoint development issue where a custom component doesn’t behave consistently across different site collections, even though the deployment package and configuration are identical.

From what I can tell, the issue seems to appear only when the component interacts with list data that’s being loaded dynamically, and I’m trying to narrow down whether this is related to permissions, caching, or how the API calls are being handled on specific sites.

At this point, I’m mainly stuck on two things:

• The component loads fine, but certain list queries return empty responses on one site while working normally on others.
• Debug logs show no obvious errors, but the UI occasionally fails to render when the same web part is added to a different site template.

Answer 1

Hi Conover Kathrina Jr

Thank you for reaching out to Microsoft Q&A forum

Based on your description, I understand that your custom component renders, but list queries return empty on certain site collections, and the web part fails on pages from different site templates. As far as I know, in SharePoint, this typically indicates site‑specific factors:

• Content approval/draft visibility or item‑level permissions hiding items for non‑approvers
• List view threshold (5,000 items) affecting un‑indexed filters
• Page/template differences (modern vs. classic, NoScript/custom script) or SPFx quirks on classic publishing pages.

First of all, kindly confirm visibility/permissions, then rule out throttling, and finally validate page/template capabilities. Apply the minimal fix per finding. 

Check content approval & draft visibility: In the failing list’s Versioning Settings, review Require content approval and Draft Item Security. If drafts are restricted to approvers, non‑approvers see zero results. 

Validate effective permissions: Use REST on the list: /_api/web/lists/getbytitle('<List>')/EffectiveBasePermissions and interpret with SP.BasePermissions.has(SP.PermissionKind.viewListItems). 

Avoid list throttling: Index columns used in $filter/CAML <Where>, keep queries under 5,000 items, and page results; avoid unbounded RecursiveAll. 

Stabilize rendering across templates/pages: Test on a modern site page vs. classic publishing page; check NoScript/custom script (DenyAddAndCustomizePages) and ensure assets/CDN paths are reachable. 

Diagnostic hygiene (optional but helpful): Add Cache-Control: no-cache to GETs and use ETags (If-Match/If-None-Match) to avoid stale reads/writes during testing.   

Additionally, I think you can try the PowerShell approaches below to see it if can fulfill your concern:

Connect-SPOService -Url https://<tenant>-admin.sharepoint.com
$siteUrl = "https://<tenant>.sharepoint.com/sites/<SiteName>"
$listName = "YourList"

# Load PnP module
Connect-PnPOnline -Url $siteUrl -Interactive
# Get list settings
$list = Get-PnPList -Identity $listName
$list.EnableModeration # Shows if content approval is enabled
# Update Draft Item Security to allow readers
Set-PnPList -Identity $listName -DraftVersionVisibility Reader

Link references:

https://pnp.github.io/powershell/cmdlets/Set-PnPListItem.html

https://support.microsoft.com/en-gb/office/require-approval-of-items-in-a-list-or-library-cd0761c4-8c3f-4ea2-9435-13c28aa23d08

https://learn.microsoft.com/en-us/sharepoint/allow-or-prevent-custom-script

Hope my answer will help you, for any further concern, kindly let me know in the comment section

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